Title: Compressive loading causes unique mechanism of failure in second generation sliding hip screw

Authors: Monique Bethel; Jeffrey Levenda; Peter Hogg; Daniel Alge; Tien-Min G. Chu; Brian Mullis

Addresses: Department of Orthopedic Surgery, Indiana University School of Medicine, Wishard Health Services, Myers Building, 1001 W. 10th St. Indianapolis, IN 46202, USA ' Department of Orthopedic Surgery, Indiana University School of Medicine, Wishard Health Services, Myers Building, 1001 W. 10th St. Indianapolis, IN 46202, USA ' Department of Orthopedic Surgery, Indiana University School of Medicine, Wishard Health Services, Myers Building, 1001 W. 10th St. Indianapolis, IN 46202, USA ' Weldon School of Biomedical Engineering, Purdue University, 206 S. Martin Jischke Dr., West Lafayette, IN 47907, USA ' Department of Orthopedic Surgery, Indiana University School of Medicine, Wishard Health Services, Myers Building, 1001 W. 10th St. Indianapolis, IN 46202, USA; School of Dentistry, Indiana University, 1121 West Michigan St. Indianapolis, IN 46202, USA ' Department of Orthopedic Surgery, Indiana University School of Medicine, Wishard Health Services, Myers Building, 1001 W. 10th St. Indianapolis, IN 46202, USA

Abstract: The sliding hip screw (SHS) has been used for the fixation of intertrochanteric hip fractures for decades. Newer devices have been designed to address persistent failures in SHS; however, the superiority of all new devices has not been established. We compared the stability of a classic SHS to a 2nd generation device. Intertrochanteric fractures were created in cadaveric and synthetic femurs, and then repaired with either a 1st generation SHS or a 2nd generation SHS. Fixation by both implants was tested by compressive loading. There was a significantly higher rate of failure via rotational instability of the proximal fragment (p < 0.05) with the 2nd generation SHS due to disengagement of an anti-rotational bushing mechanism. Further studies are needed to determine if this study translates to concerns for higher failure rates in the clinical setting, however our results suggest that there is no benefit to the use of this 2nd generation device.

Keywords: dynamic helical hip screws; dynamic hip screws; DHS; intertrochanteric hip fracture; helical blade; spiral blade; locking SHS; sliding hip screws; biomechanics; compressive loading; failure mechanisms; second generation hip screws; fracture fixation; rotational instability.

DOI: 10.1504/IJMEI.2013.057185

International Journal of Medical Engineering and Informatics, 2013 Vol.5 No.4, pp.311 - 320

Received: 13 Nov 2012
Accepted: 08 Apr 2013

Published online: 28 Jan 2014 *

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